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Thread: 78" 54 pitch prop

  1. 08-27-2015, 09:11 AM #1
    CamTom12
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    Default 78" 54 pitch prop

    Anyone tried one on a short wing?
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  2. 08-27-2015, 11:39 AM #2
    eskflyer
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    Default Re: 78" 54 pitch prop

    Have been using a 78/45 klip tip with 160 hp perfect combo for speed and takeoff performance that we could come up with.
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  3. 08-27-2015, 11:14 PM #3
    CamTom12
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    Default Re: 78" 54 pitch prop

    What's your static rpm?

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  4. 08-28-2015, 01:17 AM #4
    eskflyer
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    Default Re: 78" 54 pitch prop

    Static 2375 wide open 2700. Tach has been verified with digital. Did dynamic balance also and made a big difference in engine being much smoother.
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  5. 08-28-2015, 06:29 AM #5
    Brian
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    Default Re: 78" 54 pitch prop

    Outside of a difficult field approval is there an STC applicable to a McCauley 78 inch prop on a PA22? I know Svenns has an STC SA-02670CH for Installation of the 82 inch McCauley 1A175GM propeller in pitch range of 40 to 45 for PA22's. Then their is the infamous Borer STC but limited to PA18's. Staying within the limitatations of the 1A6 TCDS, the 74DM seems to be the only approved choise for the O-320 PA22's (excepting the Hartzel CS prop) and I've tried several 74DM in pitch ranges all the way from 50 to 61, and seems the only all round performer for climb/speed is in the 56 to 58 range.
    Last edited by Brian; 08-28-2015 at 06:36 AM.
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  6. 08-28-2015, 10:07 AM #6
    eskflyer
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    Default Re: 78" 54 pitch prop

    My prop was a 1a175 gm borer rebuilt to a 78 / 45
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  7. 08-28-2015, 10:07 AM #7
    CamTom12
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    Default Re: 78" 54 pitch prop

    Brian, that's true. That's why I dropped this in the experimental subforum.

    Eskflyer, thanks for the info.

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  8. 08-28-2015, 01:53 PM #8
    Bruce
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    Default Re: 78" 54 pitch prop

    Probably still a paperwork hassle getting it certified and back to phase one and all.
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  9. 08-28-2015, 02:15 PM #9
    CamTom12
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    Default Re: 78" 54 pitch prop

    I need to re-read the pub, but I think as far as props are concerned, only going from fp to cs and vice versa requires phase 1.

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  10. 08-31-2015, 04:55 PM #10
    Pacer 24C
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    Default Re: 78" 54 pitch prop

    Found my M74DM6-56 to be the best of any on 150HP- 2400 static verified with DynaVibe Pacer 1060lbs 800 tires solo full fuel S/L takeoff 250ft(1 notch flap) climb 1100 fpm, cruise 125 @ 2500 (throttle way back with 56 pitch) top speed 143 verified
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